<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>String对象</title>
		<script>
		 var str="hello,hubing";
		 str=str.toUpperCase();
		 alert(str);
		 alert(str.big());
		 document.write(str.big());
		 document.write(str.length);
		</script>
	</head>
	<body>
	</body>
</html>
